LoFive RISC-V
Single-unit price: $25.00 + shipping
Not available / campaign end date: Sat, 07 Oct 2017 16:59:00 PDT
Backers: 121
Target: 100
Funded: 257%
Product Details
Name
LoFive RISC-V
Brand / Manufacturer
QWERTY Embedded Design, LLC
Product Description
LoFive is a lightweight SiFive Freedom E310 open source SoC evaluation kit. The E310 leverages the Free and Open RISC-V Instruction Set Architecture originally developed by UC Berkeley and now has wide industry support via the RISC-V Foundation. Don't let the board's understated name and openness fool you - this MCU packs some impressive specs and the board was designed by the prolific QWERTY Embedded Design founder, Michael Welling.
Schematics
(click to open a larger image)
Specifications
- MCU – SiFive Freedom E310 (FE310) 32-bit RV32IMAC processor @ up to 320+ MHz (1.61 DMIPS/MHz)
- Storage - 128-Mbit SPI flash (ISSI IS25LP128)
- Expansion - 2x 14-pin headers with JTAG, GPIO, PWM, SPI, UART, 5V, 3.3V and GND
- Misc - 1x reset button, 16 MHz crystal
- Power Supply - 5V via pin 1 on header; Operating Voltage: 3.3 V and 1.8 V
- Dimensions - 38 x 18 mm (estimated)
- License - CERN Open Hardware Licence v1.2
Resources
Blog Posts
Why GroupGets?
This group buy will be used to fund the first batch and seed the community with a new RISC-V based microcontroller board.
External Links
Purchase Information
Unit Deliverable
1 LoFive
Unit Price
$25.00
Campaign Part #
GG-P-353
Availability
Not available / campaign funded, end date: Sat, 07 Oct 2017 16:59:00 PDT
Factory Lead Time
3-5 weeks after close of campaign. Days
Options and Add-Ons
FTDI Breakout - FTDI FT2232H-56Q MINI MDL
$30.78
FTDI Breakout used for programming the LoFive. 
Premium Female/Male 'Extension' Jumper Wires - 20 x 3" (7.62cm)
$3.50
20x3" (7.62cm) Female to Male Jumper Wires. 
Premium Male/Male Jumper Wires - 20 x 3" (7.62cm)
$3.50
20x3" (7.62cm) Male to Male Jumper Wires. 
Premium Female/Female Jumper Wires - 20 x 3" (7.62cm)
$3.50
20x3" (7.62cm) Female to Female Jumper Wires. 
Full sized breadboard
$8.50
This is a 'full-size' breadboard, 830 tie points. Good for small and medium projects. It's 2.2" x 7" (5.5 cm x 17 cm) with a standard double-strip in the middle and two power rails on both sides. The back is made of foam double-sided tape, if you remove the protective paper you can attach it to a flat clean surface. 
Diffused RGB 5mm LED (25 pack)
$15.25
Diffused 5mm tri-color LEDs with separate red, green and blue LED chips inside! * Pack of 25 diffused RGB LEDs * 5mm diameter * Red: 630 nm wavelength, Green: 525 nm, Blue: 460 nm * Red: 1.9-2.3V Forward Voltage, at 20mA current, Green: 3.0-3.4V, Blue: 3.0-3.4V * Red: 3000 mcd typical brightness, Green: 5000 mcd, Blue: 900 mcd 
Through-Hole Resistors - 220 ohm 5% 1/4W - Pack of 25
$1.25
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GroupGetsAnother creative overseas shipping option may be to use "shipito" to send this board and items from other US sites to reduce overall shipping costs: https://www.shipito.com/en/. We used to have cheaper overseas shipping options but we had a high rate of loss of expensive items. We are re-evaluating our current stance for lower cost items going forward but unfortunately we won't have a solution implemented for this campaign.
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bruce@...I ordered some in this campaign, but now I have one already! Photo taken at an airport gate at SFO, on my way back to Moscow. I didn't get a chance to try it yet (just arrived home). https://pbs.twimg.com/media/DMDeaemVAAAIW4g.jpg
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GroupGets
Test panel passed validation - moving forward with full the production run! https://twitter.com/groupgetscom/status/925894588820111360
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GroupGets
The on-board flash is programmed via JTAG and a special version of OpenOCD built into the Freedom-E SDK.
LoFive currently support using the FT2232H-56Q FTDI breakout adapter.Wire the breakout adapter as follows:
LoFive Pin FT2232H-56Q Breakout Pin
+5Vin VBS
GND GND
TRSTN AD5
TCK AD0
TDO AD2
TMS AD3
TDI AD1
UART0.TX BD1
UART0.RX BD0This will power the board and allow you to program it with an updated Freedom-E SDK.
The Freedom-E SDK version that is ported for LoFive is here:
https://github.com/mwelling/freedom-e-sdkOnce the SDK is installed and compiled you can load the code via make upload.
For instance to load the LED demo:
make upload PROGRAM=led_fade BOARD=freedom-e300-lofiveThis SDK only supports running on Linux.
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Peter LawlerFor my own reference, the FT2232H-56Q FTDI breakout adapter can be found:
http://www.ftdichip.com/Products/Modules/DevelopmentModules.htm#FT2232H-56_Mini
Here's a link for DigiKey's page if others would rather buy from them.
https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/FT2232H-56Q-MINI-MDL/768-1278-ND/5994775Is this just using SPI, I'm wondering what other programmers may work or whether there is something very specific to the mentioned board. I can appreciate if you only want to support folks who are using the programmer you have, cuts down possibilities. It would be nice to know, though. I'm getting two boards so can do comaparitive testing on programmers. Might try the Adafruit single channel FT232H https://www.adafruit.com/product/2264
Post last edited: over 2 years ago
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GroupGets
We have begun shipping LoFives! Wiki for development here: https://github.com/mwelling/lofive/wiki
Approved ✓
We are proud to support LoFive RISC-V in reaching its goal. Once the target has been reached the product will be distributed to all backers. Don't miss out on becoming a backer!
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